it's about as legit as a good Shaman/Boomkin sending enemies flying from Lumber Mill, totally legit
By the way, as a DK, I can grip someone from the upper ramp level without being in LoS in WSG.
Never know. They may make it so that you cannot life grip a person with the flag.
I was on my druid once and just suddenly got life gripped from the end of the tunnel to almost all the way across the open field. 3 life grips back to back. I guess the first one did it and the other priests were like why the hell not?